Bullock revealed her private phobias to an appreciative Comic-Con audience in Hall H on Saturday, where Warner Bros. showed an exclusive, stunning sequence of the film.

Clooney and Bullock battle the destruction of their ship in deep space. Though the movie will be released in 3D, they did not show the clip in that format.

Cuaron, who criticized the flaws and excessive use of 3D on Thursday, first pitched the movie as a "space suspense in 3D" — back when it was cool.

That was almost five years ago.

When Alfonso Cuaron first finished writing the script, he promised cinematographer Emmanuel “Chivo” Lubezki they would finish it in one year. The film had just two main characters and a simple premise.

“We can shoot it in one year and we’re out,” Cuaron recalled telling Lubezki, with whom he worked on movies such as “Y Tu Mana Tambien” and “Children of Men.”

Cuaron then spent years trying to figure out how to shoot the film, which required recreating zero gravity for extended takes that show a space station blowing to pieces and the astronauts struggling to survive.

Cuaron has a predilection for long takes, so he and his team used different technologies for different segments, includng one that placed Bullock in a nine-by-nine cube where everything around her moved and she was static. All of the segments shared one common element – they were very painful.

“It’s been an amazing miscalculation,” Cuaron said. “It was supposed to be ready last November and was not ready. I haven’t finished it yet. One day I’ll finish it.”

“Gravity,” whether Cuaron is ready or not, is scheduled to come out this fall.